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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Finished goods $ 798 $ 764
Raw materials 14 25
Work in process 835 675
Supplies 84 79
Total (approximates current cost) 1,731 1,543
Increase (Decrease) to last in, first out (“LIFO”) costs 4 (7)
Inventory 1,735 1,536
Recognized as:    
Inventories 1,488 1,321
Other assets 247 215
Inventories valued under the LIFO method $ 127 $ 133